Which statements are true about Phylum Arthropoda?
A. Body is divided into one part.
B. Body is divided into two parts.
C. Body is divided into three parts.
D. Jointed legs
E. Circulatory system is of closed type.
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → C and D only
Arthropoda (“jointed feet”) is the largest phylum of animals: insects, spiders, scorpions, crabs, prawns, centipedes. Their body is covered by a hard chitinous exoskeleton and is divided into head, thorax and abdomen.
A. Body is divided into one part. Incorrect. The arthropod body is segmented and grouped into regions, not a single undivided part.
B. Body is divided into two parts. Incorrect. The typical arthropod body has three regions; only in some groups, such as spiders, are the head and thorax fused into one cephalothorax.
C. Body is divided into three parts. Correct. The body consists of head, thorax and abdomen, as in an insect.
D. Jointed legs Correct. Jointed appendages are the feature that gives the phylum its name.
E. Circulatory system is of closed type. Incorrect. Arthropods have an open circulatory system: the blood flows through open spaces (the haemocoel) bathing the organs, not only through closed vessels.